I'm not aircrew, so perhaps shouldn't have a dog in this fight, however, I tend to follow the Beagle line on this, regardless of who the Crew captain is, the Pilot in Charge is responsible for the safe prosecution of any manoeuvre or flight profile. Many remember rumours of a C130 landing at the wrong airfield in Turkey, when the Nav was "Harry Staish". ISTR that it was "Harry" who carried the can in that event, but did the bloke in the left hand seat get it wrong ?
Smudge